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Real-time processor based on FPGA and DSP for atmospheric parameters evaluation from closed-loop data of adaptive optical system
Mu, Jie1,2,3; Zheng, Wenjia1,2; Li, Mei1,2; Rao, Changhui1,2; Mu, J.
Volume8418
Pages841808
2012
Language英语
ISSN0277786X
DOI10.1117/12.971172
Indexed ByEi
Subtype会议论文
AbstractTo realize the measurement of atmospheric parameters, a kind of real time processor based on FPGA and DSP is proposed and designed. When Adaptive Optical (AO) system is close-loop, the FPGA reconstructs the open-loop Zernike coefficients from the close-loop data of residual slopes and corrected voltages, which are used for the later complex statistical calculations of the coherence length r0, the outer scale L0, the wind speed v and the coherence time t0 by the DSP. The errors of the open-loop Zernike coefficients reconstructed by FPGA are less than 3×10-8 λ (λ is the wavelength). The errors of the atmospheric parameters computed by DSP are less than 7.8×10-8 cm (r0), 5.3×10-5 m (L0), 7.5×10-7 m/s (v) and 4.0×10-6 ms (t0), respectively. For 127-element AO system at 1.8m telescope with 2000Hz sampling frequency, the processing latencies of FPGA and DSP are 19.65us and 553.8ms respectively, and the refresh time of atmospheric parameters is 1.85s. The results show that the proposed processor can be used to measure the real time atmospheric parameters. © 2012 SPIE.; To realize the measurement of atmospheric parameters, a kind of real time processor based on FPGA and DSP is proposed and designed. When Adaptive Optical (AO) system is close-loop, the FPGA reconstructs the open-loop Zernike coefficients from the close-loop data of residual slopes and corrected voltages, which are used for the later complex statistical calculations of the coherence length r0, the outer scale L0, the wind speed v and the coherence time t0 by the DSP. The errors of the open-loop Zernike coefficients reconstructed by FPGA are less than 3×10-8 λ (λ is the wavelength). The errors of the atmospheric parameters computed by DSP are less than 7.8×10-8 cm (r0), 5.3×10-5 m (L0), 7.5×10-7 m/s (v) and 4.0×10-6 ms (t0), respectively. For 127-element AO system at 1.8m telescope with 2000Hz sampling frequency, the processing latencies of FPGA and DSP are 19.65us and 553.8ms respectively, and the refresh time of atmospheric parameters is 1.85s. The results show that the proposed processor can be used to measure the real time atmospheric parameters. © 2012 SPIE.
Conference NameProceedings of SPIE: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Smart Structures, Micro- and Nano-Optical Devices, and Systems
Conference Date2012
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Document Type会议论文
Identifierhttp://ir.ioe.ac.cn/handle/181551/7770
Collection自适应光学技术研究室(八室)
Corresponding AuthorMu, J.
Affiliation1. Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
2. Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China
3. Graduate School of Chinese Academy of Sciences, Beijing 100039, China
Recommended Citation
GB/T 7714
Mu, Jie,Zheng, Wenjia,Li, Mei,et al. Real-time processor based on FPGA and DSP for atmospheric parameters evaluation from closed-loop data of adaptive optical system[C],2012:841808.
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